Rockwell Automation 1771-IR , D17716.5.76 RTD INPUT MODULE - Manual (Page 36)

Module Calibration
Chapter 7
7Ć3
Table 7.A
Write Block Transfer Word 15
Word Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Inhibit Calibration on Channel Requested Auto-Calibration
Word 15 Set
these
bits to 0
6 5 4 3 2 1 Set these bits to 0
Requested
Save
Values
Requested
Gain Cal.
Requested
Offset Cal.
NOTE: Normally, all channels are calibrated simultaneously (bits 10–15 of
word 15 are octal 0). To disable calibration on any channel, set (1) the
corresponding bit 10 through 15 of word 15.
4. Queue block transfer reads (BTRs) to monitor for offset calibration
complete and any channels which may have not calibrated successfully.
Refer to Table 7.B.
Table 7.B
Read Block Transfer Word 9
Word
Bit
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Uncalibrated Channels Auto-Calibration Status
Word 9
Not
used
6 5 4 3 2 1
Cal.
Fault
EEPROM
Fault
Not used
Save to
EEPROM
Complete
Gain Cal.
Complete
Offset Cal.
Complete
5. Proceed to gain calibration below.
Gain Calibration
Calibrating gain requires that you apply 402.00 ohms across each input channel.
Normally all inputs are calibrated together. To calibrate the gain of an input,
proceed as follows:
1. Connect 402.00 ohm resistors across each input channel as shown in
Figure 7.2.